As an example, say you have two lenses:
300mm, f/2.8 being used at f/8
300mm, f/4 being used at f/8
My understanding is that by definition the amount of light coming through the aperture means that ...

Many (all?) lenses have a (slightly) curved focal plane. In general it's close enough to flat that you don't really notice it, but under certain conditions it may become apparent. As I understand it ...

In the reviews of lenses with image stabilisation systems there are quite often written the quality of its performance represented by the number of f-stops (2-4 f-stops).
As far as I understand, it ...

I have been told that it is difficult to focus with an aperture of f/1.4.
So, in which kind of scenes does it actually make sense to use the f/1.4?
In portraits they say that it is important to keep ...

For sports, I know that a faster lens would usually be considered more important than image stabilization, but what if, after selecting your shutter speed, your camera is picking apertures that don't ...

I’m looking to add a second lens to my kit lens I got with my Nikon d7000.
I have read several reviews on both the 35 and 50 mm lenses made by Nikon in particular that said using either lens at the ...